Add tests and fix major version comment

post_results/misc-checks.go

@@ -36,18 +36,16 @@ type versionRecord struct {
 type versionRecordSlice []versionRecord
 
 func (s versionRecordSlice) MajorVersionChanges() string {
-	if len(s) == 0 {
-		return fmt.Sprintf("No major YANG version changes in commit %s", commitSHA)
-	}
-
 	var b strings.Builder
-	b.WriteString(fmt.Sprintf("Major YANG version changes in commit %s:\n", commitSHA))
 	for _, change := range s {
 		if change.OldMajorVersion != change.NewMajorVersion || change.NewVersion == "" {
 			b.WriteString(fmt.Sprintf("%s: `%s` -> `%s`\n", change.File, change.OldVersion, change.NewVersion))
 		}
 	}
-	return b.String()
+	if b.Len() == 0 {
+		return fmt.Sprintf("No major YANG version changes in commit %s", commitSHA)
+	}
+	return fmt.Sprintf("Major YANG version changes in commit %s:\n%s", commitSHA, b.String())
 }
 
 func (s versionRecordSlice) hasBreaking() bool {

post_results/misc-checks_test.go

@@ -77,3 +77,84 @@ func TestHasBreaking(t *testing.T) {
 		})
 	}
 }
+
+func TestMajorVersionChanges(t *testing.T) {
+	prevCommitSHA := commitSHA
+	commitSHA = "a0"
+	defer func() {
+		commitSHA = prevCommitSHA
+	}()
+	tests := []struct {
+		desc                    string
+		inVersions              versionRecordSlice
+		wantMajorVersionChanges string
+	}{{
+		desc: "deleted",
+		inVersions: versionRecordSlice{{
+			File:            "openconfig-deleted.yang",
+			OldMajorVersion: 1,
+			NewMajorVersion: 0,
+			OldVersion:      "1.0.0",
+			NewVersion:      "",
+		}},
+		wantMajorVersionChanges: "Major YANG version changes in commit a0:\nopenconfig-deleted.yang: `1.0.0` -> ``\n",
+	}, {
+		desc: "minor",
+		inVersions: versionRecordSlice{{
+			File:            "openconfig-acl-submodule.yang",
+			OldMajorVersion: 1,
+			NewMajorVersion: 1,
+			OldVersion:      "1.1.3",
+			NewVersion:      "1.2.3",
+		}},
+		wantMajorVersionChanges: `No major YANG version changes in commit a0`,
+	}, {
+		desc: "patch",
+		inVersions: versionRecordSlice{{
+			File:            "openconfig-acl.yang",
+			OldMajorVersion: 1,
+			NewMajorVersion: 1,
+			OldVersion:      "1.2.2",
+			NewVersion:      "1.2.3",
+		}},
+		wantMajorVersionChanges: `No major YANG version changes in commit a0`,
+	}, {
+		desc: "one",
+		inVersions: versionRecordSlice{{
+			File:            "openconfig-interface-submodule.yang",
+			OldMajorVersion: 0,
+			NewMajorVersion: 1,
+			OldVersion:      "0.5.0",
+			NewVersion:      "1.0.0",
+		}},
+		wantMajorVersionChanges: "Major YANG version changes in commit a0:\nopenconfig-interface-submodule.yang: `0.5.0` -> `1.0.0`\n",
+	}, {
+		desc: "major",
+		inVersions: versionRecordSlice{{
+			File:            "openconfig-interface.yang",
+			OldMajorVersion: 1,
+			NewMajorVersion: 2,
+			OldVersion:      "1.1.3",
+			NewVersion:      "2.0.0",
+		}},
+		wantMajorVersionChanges: "Major YANG version changes in commit a0:\nopenconfig-interface.yang: `1.1.3` -> `2.0.0`\n",
+	}, {
+		desc: "minor",
+		inVersions: versionRecordSlice{{
+			File:            "openconfig-packet-match.yang",
+			OldMajorVersion: 1,
+			NewMajorVersion: 1,
+			OldVersion:      "1.1.2",
+			NewVersion:      "1.2.0",
+		}},
+		wantMajorVersionChanges: `No major YANG version changes in commit a0`,
+	}}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			if got, want := tt.inVersions.MajorVersionChanges(), tt.wantMajorVersionChanges; got != want {
+				t.Errorf("got %v, want %v", got, want)
+			}
+		})
+	}
+}